This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 84 |
| 2 | 3486 |
| 3 | 95284 |
| 4 | 1929501 |
| 5 | 30872016 |
| 6 | 406481544 |
| 7 | 4529365776 |
| 8 | 43595145594 |
| 9 | 368136785016 |
| 10 | 2761025887620 |
| 11 | 18574174153080 |
| 12 | 112992892764570 |
| 13 | 625806790696080 |
| 14 | 3173734438530120 |
| 15 | 14810760713140560 |
| 16 | 63871405575418665 |
| 17 | 255485622301674660 |
| 18 | 950974260789566790 |